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03-01-20, 08:55 AM | #91 | |
Swabbie
Join Date: Jul 2016
Location: Serbia
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Quote:
Alrighty, I measured again and here are the numbers, these are from the 1st of September 1939, 16:00 GMT (17:00 hrs local) Ho 21° 34' dec N 8° 27.4' lat N 54° 41' The Sun's GHA at the time of measurement is 59° 58.0 and I know that my actual longitude is around 19° 04' E. I've been wondering about the accuracy of SH5's celestial sphere, but I found that latitude myself and it's pretty accurate to what the ingame navigator calculates so I'm hoping it's good enough for longitude too (also I measured that sun angle in a slightly rough sea so if the result is a bit different than expected that's the reason why) |
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03-01-20, 04:34 PM | #92 |
Grey Wolf
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Okay, so here's how the calculation should have gone:
acos((sin(21°34') - sin(8°27.4') · sin(54°41')) / (cos(8°27.4') · cos(54°41'))) acos((0.367583568 - 0.147061367 · 0.815969464) / (0.98912737 · 0.578095005)) acos((0.367583568 - 0.119997585) / 0.571809592) acos(0.247585984 / 0.571809592) acos(0.432986762) = 64.34274255 or 64°20.6' If we subtract the GHA of the Sun from the LHA, we get a longitude of 4°22.6' E. This is also clearly wrong. I did check your data for the Sun on the date you gave and it is correct. I'm not sure how you initially got a value of 0.82, though. Anyway, you wrote that you "measured that sun angle in a slightly rough sea so if the result is a bit different than expected that's the reason why". That's perfectly normal under the conditions. However, if we calculate what the altitude of the Sun should have been at that time and location, we get: asin(sin(8°27.4) · sin(54°41') + cos(8°27.4) · cos(79°02') · cos(54°41')) = 13°13.5' That's a difference of 8°20.5' from your measured altitude. This is far too much error for an accurate determination of longitude (or for any navigational purpose). An error of a few tenths of an arcminute would be acceptable. Even a measurement error of one whole arcminute at that latitude would result in an error in longitude of a little more than 1 nautical mile. (Note also: the farther off your estimated latitude is from your actual latitude, the greater the error in longitude will be. However the closer the Sun is to due East or West when the sight is taken, the smaller this error will be. But I don't think that is the problem here. The azimuth of the Sun at the time of your sight should have been 266° - almost due West.) In summary: the only problem I can find is in the measured altitude of the Sun. What the cause of this error is, I cannot say.
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04-01-20, 02:19 PM | #93 |
Watch
Join Date: Apr 2007
Posts: 24
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Hello
In the first page I cannot see the images. Can someone post them? I don't find a good sextant tutorial anywhere. only this french one, but it is complicated to me: http://www.mille-sabords.com/forum/i...howtopic=57739 Thanks! |
04-02-20, 12:44 AM | #94 | |
Grey Wolf
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Quote:
If you need help understanding how to do celestial navigation in general, I can assist you with that.
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04-02-20, 12:06 PM | #95 |
Navy Seal
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Here is also a table of corrections for local apparent noon latitude calculations in SH5 world which I have created during my extensive testing.
http://www.mediafire.com/file/5i7853...ions.docx/file Note that this applies to TWoS only. I still have to learn and test longitude calculations, lat/long determination using stars ect. In general my conclusion is that in SH5 world the "sky" is accurate and follow real world rules but certain corrections have to be applied for highly accurate results... Happy navigating.
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04-05-20, 09:15 AM | #96 |
Bosun
Join Date: Feb 2011
Posts: 66
Downloads: 95
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I've come back !
After a 10 year break of playing I'm back into the game. Specially during these current times I'm looking for some help. On getting mods up-to-date. I have the steam version and the uplay download version of the game from long ago.
I currently use these mods looking cleanup and update mods any help would greatly be appreciated in consolidating and updating and removing mods that are no longer needed or obsolete. Best Regards, d3vnu11 Generic Mod Enabler - v2.6.0.157 [C:\Program Files (x86)\Steam\steamapps\common\Silent Hunter 5\MODS] Magnum_Opus_v0_0_1 IRAI_0_0_30_ByTheDarkWraith NewUIs_TDC_6_8_0_ByTheDarkWraith NewUIs_TDC_6_8_0_Real_Navigation FX_Update_0_0_19_ByTheDarkWraith TheDarkWraith_DC_Water_Disturbances_v2_0_SH5 Dynamic Environment SH5 Basemod (realistic version) V2.1 Dynamic Environment SH5 BrighterNights V2.1 Dynamic Environment SH5 Undersea (temperate and polar) V2.1 Dynamic Environment SH5 Waves (realistic version) V2.1 Dynamic Environment SH5 Sounds V2.1 Stormys DBSM SH5 v1.3 Basemod Stormys DBSM SH5 v1.3 HOTFIX 3 Stormys DBSM SH5 v1.3 optional scary creaks Stormys DBSM SH5 v1.3 optional remaining orig sounds converted to 22Khz Stormys DBSM SH5 v1.3 optional NavMap babelling Stormys DBSM SH5 v1.3 additional crew sounds beta6 Trevally Automated Scripts v0.6 sobers see thru wake fix sobers smaller water drops Equipment_Upgrades_Fix_1_2_byTheBeast stoianm EnvWeather V1 SH5 Manos Scopes-patch for 16x9 Critical hits 1.1 Torpedos Critical hits v 1.2 EQuaTool 01.01 by AvM - double set - Large plus Flat Style Church's NavMap v1.0 - Illyustrator's Version Church's NavMap v1.0 - Red Lines Speech Recognition_MiTons_NewUI_Editon_v0.4.1_english Grossdeutscher Rundfunk AirTorpedoes TDW_Mines_Subnets_Detectable_in_hydro (OH II v1.4) OPEN HORIZONS II_full v1.4 OHII v1.4 Patch2 Full MyKey |
04-05-20, 12:15 PM | #97 |
Gefallen Engel U-666
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welcome back!
d3vnu11!
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04-05-20, 06:37 PM | #98 | |
Bosun
Join Date: Feb 2011
Posts: 66
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Quote:
[C:\Program Files (x86)\Steam\steamapps\common\Silent Hunter 5\TWoS_Parts] Never mind I just went for it after backing up the game. TWoS pretty much is the defacto expansion TWoS Real Navigation TWoS Neutrals Illuminated Only_Until [Date] TWoS Campaign Advance Verifier Testing Speech Recognition_MiTons_NewUI_Editon_v0.4.1_english TWoS Remove Map Plastic Cover TWoS SM Interior_Food Stocks Grossdeutscher Rundfunk EQuaTool 01.01 by AvM - double set - Large plus Flat Style all seems well I'm excited because I'm sailing off to help with the Baltic Operation. Big thanks to all the mod devs, and content providers you made this game a historical archive of knowledge. Best Regards, --d3v |
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04-06-20, 04:26 AM | #99 | |
Navy Seal
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Quote:
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Best regards... Vecko The Wolves of Steel v2.2.25_SH5 Expansion Pack_Full The Wolves of Steel v2.2.xx to v2.2.25 - Update PDF Install Instructions How to report an issue If You wish to support my work... |
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04-08-20, 10:53 AM | #100 |
Bosun
Join Date: Feb 2011
Posts: 66
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Thanks.
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04-14-20, 11:21 PM | #101 | |
Grey Wolf
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Quote:
I'm not sure what you're trying to accomplish by what you're doing, but I'm reporting it as spam as it is not helpful.
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If you have a question about celestial navigation ... ask me! Celestial Navigation Spreadsheet |
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04-15-20, 08:20 AM | #102 |
Bilge Rat
Join Date: Aug 2018
Posts: 1
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Hi there,I'm using the TWOS Mega mod, I love it BTW, but I don't know what is going on with Emil atm, but it's clear conditions, 0 m/s wind and so on (turned it on in the TDW Patch Viewer) and he don't give me a fix celestial Position. Anyone knows the Problem? I started a new Campaign and I'm in the Danzig Bay right now.
Maybe somebody who knows the Problem? |
04-29-20, 09:14 AM | #103 |
Chief
Join Date: Nov 2019
Location: Minnesota
Posts: 325
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This is really good stuff! It's almost identical to the Coast Guard Auxiliary Celestial Navigation lesson syllabus I studied when I was trying to get my sailing master's license back in the '89's. I think I still have the books somewhere. Thanks for posting!
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05-26-20, 02:32 PM | #104 |
Nub
Join Date: Jun 2016
Posts: 3
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Hello!
I am using Real Navigation with TWOS. I started a new campaign. When I used the sextant to calculate the coordinates I saw that the sky was behaving very strangely. If my time zone is GMT +1 then I must use the Nautical Almanac with a GMT -1 time, and if the time zone is GMT -5 then I have to use GMT +5 time (checked this with Stellarium). Only in this case will all the calculations be correct. How to fix it? And is there a way to increase the sextant zoom level to increase the accuracy of observations? Last edited by MrArt; 05-26-20 at 05:14 PM. |
05-26-20, 08:14 PM | #105 |
Gefallen Engel U-666
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Welcome aboard!
J0hnShadow! & MrArt!
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